Oscillating propeller



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Patented Peb. 26', 1895.

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JOHN .I. BRANDT, OF SAN FRANCISCO, CALIFORNIA.

SPECIFICATION forming part of Letters Patent No. 534,737, dated February 26, 1 895.

Application filed March 27, 1894.

To @ZZ whom me/,y concern:

Be it known that I, JOHN J. BRANDT, a sub Ject ofthe King of Sweden and Norway, residing in the city and county of San Francisco and State of California, have invented certain new and useful Improvements in Propelling Apparatus for Vessels; and I hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in propelling mechanism for boats or vessels and more particularly to vertically oscillatin g paddles; and the objects of my improvements are, first, to provide a paddle in which simple and novel means are employed for reversing the position and limiting the play of the blade; second, to afford facilities for the direct connection between the motive power and the paddle; and, third, to so position the b lades and provide for their relative oscillations as to lessen the vibratory motion imparted to the vessel by their action.

My invention more particularly resides in the novel combination, construction, and arrangement of parts, all as more fully hereinafter described, and set forth in the claims.

I have clearlyillustrated the invention in the accompanying drawings, which, with the letters of reference marked thereon, form' a part of this specification, and in which- Figure lis a vertical longitudinal elevation and part section of my propelling apparatus' as positioned on a vessel. Fig. 2 is a transverse elevation and part section of one of the blades and connections. Fig. 3 is a ground plan of the deck and mechanism for reversing the position of the propelling blades, and Fig. 4 is a ltransverse section of one of the blades taken through the line a: Qc Fig. 2.

Reference being had to the above ligures, B B represent two oscillating arms to the lower extremities of which are pivoted the propelling blades A A, the latter being held in the required position by means of the metal bands or strips C which pass around the collars F on the lower portions of the arms B. The upper extremities of the arms B, above the deck L of the Vessel, are revolubly secured to the parallel guides H by means of the nut G. EX- tending perpendicularly outward from the Serial No. 505,295. (No model.)

central portion of the arms B are the pivots 'R which are adapted to enter a suitable retion the plates P and Q as well as the arms B are revolubly secured to the deck of the vessel, thereby adapting the arms B and blades A to be swung about until the latter `assume the position shown in dotted lines in Fig. 1.

Journaled in suitable bearings M and N above the deck L of the vessel is the longitudinal shaft I which contains the double crank-arms .I the latter bearing the slides K which operate in the parallel guides II. The

the latter revolve the arms B are caused-to os"- cillate simultaneously in opposite directions.

It will be readily seen from Fig. fl that as the lower portions of the arms B oscillate in a direction toward the upper portion of the drawings, the resistance of the water against the blade C will cause it to assume the position shown in the dotted lines below the main ligure, and as the blades oscillate in the opposite direction the dotted lines above the main figure represent the position they assume, and it is further manifest that as the result of this motion the vessel is propelled in a direction toward the right hand margin of the drawings. Y

I will now explain the construction and method of operation of the mechanism for reversing the position of the blades A. kPassing around the grooved periphery of the circular plate P and over the guide pulleys T, V and V is the wire cable or rope U,'by means of which the plates P can be quickly revolved until the blades Aare caused to assume the position shown in dotted lines in Fig. 1, when the direction or progress of the vessel is reversed without the necessity of reversing the motive power. In order to limit the amount of revolution of the plates P, I have provided the projecting pins c and d, and stops a and b against which the pins rest when the plates P are reversed. The dotted lines in Fig. 3 represent the position of the pins c -cranksJ are so situated on the shaft I that as 1 and d when the blades are reversed. Situated between the collars F on each arm B is the projection AI) which partly encircles the arm B; its object being to limit the travel of the blade A relative to the arm B as the latter oscillates in the water.

I do not desire to contine myinvention to the exact number of oscillating arms and blades secured thereto, but itis preferable to use the arms in pairs which oscillate simultaneously in opposite directions, as any liability of a vibratory lnotion being imparted to the vessel is counteracted by the opposite Vibrations imparted by the other blade. \I am also aware that the arms and blades may be employed to advantage in an ordinary row-boat, as the ar-m may then be pivoted to the stern of the boat, the lower portion bearing the swinging blade being immersed in the Water while the upper portion or handle may be swung, by hand, backward and forward thereby imparting to the boat the desired forward or backward motion, without the eX- ercise of the skill necessary in the successful manipulation of the ordinary sculling oar.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

l. A propellingr apparatus for vessels consisting of one or more vertically oscillating arms having a blade revolubly secured to the immersed portion thereof, each of said arms being composed of two members swivelly connected to permit of the revolution of one member independent of the other substantially as and for the purpose set forth.

2. A propelling apparatus for vessels consisting of one or more oscillating arms having a blade revolubly secured to the submerged portion thereof While the other extremity is pivotally connected to a secondary arm into which is adapted to slide the pin of it revoluble crank, as and for the purpose set orth.

3. A propelling apparatus for vessels consisting ot one or more oscillating arms having a blade revolubly secured to the submerged portion thereoi", a revoluble support for and pivoted to said arm and a secondary arm revolubly secured to said main arm and bearing a longitudinal groove into which is adapted to slide the pin of a revoluble crank, substantially as shown and for the purpose set forth.

4. A propelling apparatus for vessels con sisting of one or more oscillating arms having a blade revolubly secured to the immersed portion thereof, a secondary arm revolubly secured to the upper extremity of said main arm, in combination with a horizontal shaft bearing one or more crank arms directly connected with a longitudinal slot in said secondary arm, and means for revolving said primary arm independent of said secondary arm substantially as shown and for the purpose set forth.

In witness whereof I hereunto set my hand Vand Seal.

. Witnesses:

J. A. GOODWIN, ROBT. HARVEY. 

